S/ER ER Collet Hook Wrench (DM-074) Properties and application: Hook wrench for ER collet nuts Specifications: ModelL[mm]Nut diameter[mm]For collet S/ER25 168 Ø38 - Ø42 ER25-T2 S/ER32 190 Ø45 - Ø52 ER32-T2 S/ER40 210 Ø55 - Ø63 ER40-T2 S/ER50 240 Ø78 - Ø85 ER50-T2